<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <script>
        //1.Object.is 判断两个值是否完全相等
        console.log(Object.is(123, 123));//和===差不多
        console.log(Object.is(NaN, NaN));
        console.log(NaN === NaN);



        //2.Object.assign 对象的合并
        const config = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test',
        }
        const config2 = {
            host: 'sjaifniua',
            port: 2314,
            name: 'fjwieof',
            pass: 'ilovceyou',
            test2: 'sjafi'
        }
        console.log(Object.assign(config, config2));//合并的话如果和前面的相同，后面的就会把前面的覆盖掉





        //3.Object.setPrototypeOf  Object.getPrototypeof
        const school = {
            name: '山硅谷',
        }
        const cities = {
            xiaoqu: ['北京', '上海', '深圳']
        }
        Object.setPrototypeOf(school, cities);
        console.log(Object.getPrototypeOf(school));
        console.log(school);








    </script>


</body>

</html>